Hi All,

     I am using Ubuntu 11.04 and have installed processing 1.5.1 and the opencv contributed library. I then install the following Ubuntu packages for the actual C++ OpenCV libraries :

libcv2.1 libcvaux2.1 libhighgui2.1 python-opencv opencv-doc libcv-dev libcvaux-dev libhighgui-dev

     However, when I run the "brightness_contrast.pde" example for the opencv contributed library, I get the following error :

----------
!!! required library not found : /home/tkwinfo/sketchbook/libraries/OpenCV/library/libOpenCV.so: libcxcore.so.1: cannot open shared object file: No such file or directory
Verify that the java.library.path property is correctly set and 'libcxcore.so', 'libcv.so', 'libcvaux.so', 'libml.so', and 'libhighgui.so' are placed (or linked) in one of your system shared libraries folder

Exception in thread "Animation Thread" java.lang.UnsatisfiedLinkError: hypermedia.video.OpenCV.capture(III)V
    at hypermedia.video.OpenCV.capture(Native Method)
    at hypermedia.video.OpenCV.capture(OpenCV.java:945)
    at brightness_contrast.setup(brightness_contrast.java:31)
    at processing.core.PApplet.handleDraw(Unknown Source)
    at processing.core.PApplet.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:662)
----------

     The error occurs in the line :

opencv.capture( width, height );  <-- error here

     I have checked that the required library files, 'libcxcore.so', 'libcv.so', 'libcvaux.so', 'libml.so', and 'libhighgui.so' are all placed in /usr/lib. However, the processing opencv example seems could not find them and/or could not use them.

     Does anyone know that how do I add the "java.library.path" property to this processing example and is my installed OpenCV 2.1 Ubuntu package compatible with the processing opencv contributed library (it seems that this contributed library uses OpenCV 1.x but I could not find a corresponding OpenCV 1.x package in Ubuntu 11.04) ?

     Thanks for any suggestion.

Regards
Lawrence

Hi,

     I am trying to draw a picture in the "setup" method of a PApplet and then add (or embed) the PApplet into a JFrame. I have used "noLoop" in the last line of "setup" and have not used the "draw" method (I leave it blank). I have used the same size for the PApplet and the JFrame. However, when the JFrame is displayed, only a blank picture is shown on the PApplet's drawing area. The drawing area keeps blank until I perform an initial mouse click on this area. The drawing area then shows the blue rectangle correctly (but just after an initial mouse click).

The code snippet of the PApplet's program (in Java) is shown below :

    public void setup() {
        size(500, 500, P2D);
        drawImpl();
        // do something else not related to drawing
        noLoop();
    }

    public void drawImpl()  {
        stroke(50);
        fill(0,0,255);
        translate(0, 0);
        rect(0,0,30,30);
    }

     It seems that the blue rectangle is drawn normally in the PApplet's drawing area but Java has just not painted the PApplet's drawing area initially.

     Is there any way that I can put some Java codes into the PApplet's program or the JFrame's program to trigger the initial painting of the drawing area of the PApplet ?

     Thanks for any suggestion.

Regards
Lawrence

Hi ALL,

     I could only know of one method to do such convertion. That is, save the PImage object into a file (e.g. GIF file) and then load the file into a Java Image object. But this approach involves disk operations and could be a bit slower.

     Does anyone know of a method to directly transfer the PImage object to a Java Image object (i.e. no disk operation) ?

     Moreover, could a Processing PGraphics object be similiarly converted to a Java Graphics object ?

     Thanks for any suggestion.

Regards

Lawrence